Fuel/Oil Pump Change? 1986 40 VRO (Long)

[CharlesW]

The fuel pump died on my 1986 Evinrude 40 hp with VRO. The OMC kit I used to replace it had been opened and the parts bag was missing. The dealer supplied what he said were the correct parts to make the installation on my motor. Those parts were different from what I removed and I have a question or two.<br />Caps are from the OMC label, I'm not intending to shout.<br />KIT AY, F PUMP&LMTR<br />P/N 438406<br /><br />The pump seemed quite similar and fit where the old one was with no problem. My old pump was the 3 wire pump and the new pump was the four wire pump and the harness and instructions for wiring were supplied by the dealer.<br />The question I have concerns the P/N 435009 Pulse Limiter - Threaded that I was given. It had a hex requiring a wrench of about 1" and it wouldn't clear the casting rib on the engine. The one it replaced had a hex of 7/16". About an hour with a file and I had removed enough of the hex to allow it clear the engine casting and was able to install it. Everything seems to be working OK.<br />Should I have used the old pulse limiter over?<br />Is there any problem with using the larger hex pulse limiter that was supplied? <br />The old limiter had what appeared to be a metal mesh in it while the new on appears to have some light colored material that almost looks like a filter.<br />The pump allowed the engine to start almost immediately, (on fuel/oil mix), and the oil pump also pumped oil right away. I used about 3 gal of premix to be sure the VRO was working, then hooked up the tank with just gas. No alarms other than when I was first checking the oil flow from the VRO.<br />Do I need to make any revisions to this installation?<br /><br />Charles

 

[OBJ]

Re: Fuel/Oil Pump Change? 1986 40 VRO (Long)

Hey Charles. The VRO kit should have supplied a threaded nipple and two pulse limiters....one with a threaded end and the other that would fit in line with the hose going to the pump.<br /><br />Did a supersession check on your engine and this is what I got.<br /><br />First VRO pump PN for you engine was 174301. Then it was superceded in this order.<br />174432> 398711> 174875> 435554> 438404> final part number....5004562. What's different in the pumps, say between your 40hp and say, a 115, is the springs used in the diaphrams of the pumps. To weak a spring and the pump won't meet the demand of the engine. You probably got a pump for a larger engine. I don't think this will make a difference and I hope one of the other guys will either bear me out on this or tell me I'm loaded with "you-know-what".<br /><br />But....if you made all the connections solid and aren't having any problems you should be good to go. <br /><br />Did you verify that the alarms are working while you had the pre-mix tank hooked up? This is an important step with the instalation.

 

[CharlesW]

Re: Fuel/Oil Pump Change? 1986 40 VRO (Long)

Hey OBJ, thanks for the response.<br />In order of your questions and comments.<br /><br />The parts I was supplied had only the pulse limiter with the threaded end. (Had the large hex that I filed down)<br /><br />Your sequence of part numbers more or less confirms what I suspected. That I got an old pump that had been around for a while. That is probably why the parts kit had been robbed. At least it is several revisions later than the one it replaced. Hopefully, that will be a good thing.<br /><br />Connections seem to be good everywhere. The oil level in the oil tank is going down which means the oil is going somewhere.<br /><br />Yes, I did verify the alarm function after the installation, and it was working. We have had no alarms since and have run the motor for a couple of hours with no obvious problems.<br />The motor seems to run better than it has in the past, so the pump has probably been weak for some time.<br /><br />I do, and did, try to follow any instructions that I can find. My Clymers manual and my Seloc manual were virtually worthless. There was not much information regarding the actual pump change procedure. I consider myself to have average mechanical abilities, but until last April, I hadn't even started an outboard motor, let alone worked on one. It was an interesting experience with the motor on the pontoon boat and the pontoon boat in the water. <br /><br />Anyway, it seems to be working now.<br />I do have two tanks and I am keeping premix in one in case I ever feel uncomfortable running straight gas and depending on the VRO.<br />We have too many different operators for me to trust all of them to premix correctly, so the VRO system is very handy for me. When it works. <br /><br />Charles